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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c065448f8c012086ddcb4a3de2e04315a86b6376e9b6ccffba76928f587ce602' 
  AND token = '0d4egfDr3E/+3czMe6JWFUJnVbB6WYm5EVQ/I51iVTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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