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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c673344526ede121b1c9e751864a37d60c3cb0fca91f1a0e19494d2e40db68cb' 
  AND token = 'zTThAFunDpLrlr7Ig4hh8FwX9fonhbWcZPPeE6wblmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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