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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a079842d90ab528c9f4dde4eed20111345f0e42d4249826aedc55b63b1f223b' 
  AND token = 'ZwoXy60k2b8LghrLwNeHU8Q6HTSt9xOJtE29QOASVu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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