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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436e244ceacaaac4db299eae6ae5fa505296226ecea8e652b7ac8d41ecf81d21' 
  AND token = 'i0dt7t631XsmrrtQwR94Wec2FpG/BV7jkXru95K8pbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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