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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7002f1436d209f130aeffb854da0fe5705c01c7ba2a1fa285604eaf6c446a45' 
  AND token = 'BO/hWWhYpPT6/G7Uxgy9JOocV1vYDi+3vEI8+efe7YQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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