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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9476d8a185e563627a1f8867da8b4cd3eb5ef96a22fc1cdd96ed714989b1f51d' 
  AND token = 'DuIXR6h9wBIERJv4f/cm1ik5edFVqtU1E12qScYy4c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}