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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389392a1a1a8327b0e5d32225144495618b8a3a1c92c558b3a2f4da7c0ee7763' 
  AND token = 'MQ1Vn63wXknvRIYCvDgPQKQpEToNWszeGlFONLcThAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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