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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaf11798b59ece1690dcc8946ba7610585b5edc3b5fdec7e67a5464deea99e7c' 
  AND token = 'vBcZfIYWW4ftnq1EMYFsvSeKaxpC5cm9JOVqFii1Jpw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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