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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c0c5c8a7916e1ba8cec0f90e0b62c66fedaa137729aa4d4738ce4ded54e2bc1' 
  AND token = 'qxFiy4WtMJo0aeeSbZtEUm8zQEBN3VxRBhcuz+/n7zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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