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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2146d0b9289b9d53d84b9c9d5605eaa2be18c6197f6997984ed5953c0a7dfeb6' 
  AND token = '57NUngdinupWM9K4vdNF/CFLUs2C3Os2T4OfAfuIPtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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