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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2c013ac2359fe09b98685648a03aea5133643a5f018f839bb5e3a01bc422c4d' 
  AND token = 'LkD+dY8qssST5OXrHygyOJCVIW93kdUfYt2RROlWI4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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