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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c82d8c11fd07e3ebae1879b3ecd0734bde2de825c2aea2a5ffc64c6e9c6c686' 
  AND token = 'pwlgd4krW1gFPu4ZlwQEWSiX8YvlgCP3EVOq/L4LVxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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