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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1657837528fb98353a2b981931e66d5c1c53696674c68382e86f4032ad3dbda1' 
  AND token = 'z6arh2/59Ld5u8bcm6bUEjQd7c805IXnEPQ+jQ2QEBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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