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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d38b15f384fa7b5364dae3788e47180417d6da455e861c1d8390705842f30c' 
  AND token = 'QsG8ffk3Aj0kmVLMCYsWrCbes8nx/WhrqzDVDY3DeZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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