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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc1ee566f40e6479a81deccf72acb5f6b30ce836a7e8658f49fb9b0fed3820e' 
  AND token = 'CJEYT4bTQ7yICS32zL8z2w+WlQfHbdD1Qw5J6BPvMsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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