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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c763386473840f0412db7489693c80a7d325536673f81a0088e7f2784a08ea8' 
  AND token = 'Dy+S8WqjbeErzML26uKM6Suis0EZ03VQ9fQIVcnq+o4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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