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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c762103b549d93150c73188bb47b4a8d10bc37be908fff84e90526b1e1e9ea00' 
  AND token = 'ImWDWPZkSpz7W114nx3+0H9LYQ3qnGAGMEFnu8b1HbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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