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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a23bea9302c0a31fac6f3076b6de1fa5b5821c6ea7f74b08ba64e96f426316d9' 
  AND token = '+vbJCGCfgXjnFHyRicNckjtvll99nnfoB9duN5+4wN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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