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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cbcdad200492fe01dc2c6b89d2269c44fc06c50e3e52c58464cd294d2295e60' 
  AND token = '71zlrAYaw5f3Cau3gZ+jkjeYZSi6PtZtTspqSqJJrhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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