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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa63ccdbe9812377d8f60f67f2845429e2c2a2ece54824f7aa10104fa041276' 
  AND token = '5MS2xy2+l3qNfzVIksFoQCGxu2bB065nnUbH2QbtmCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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