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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0019119d08a1be26fa07fc737c179a887c21ad028d0ccabebc5b2e288be9a69f' 
  AND token = 'o1bGNMBlQZvU3xn1SHnorHGoTtxCnL1PKlP0uRfIQB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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