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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e0ed75839762af51dcd25d128c6001a6c751d8b324c0d09d6a584c627f7b59e' 
  AND token = 'PWIr1RsW8JKPN3NiqpocqCANrD69n0qGn5RWJ0LQX4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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