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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ab0532425863229d678ebe82be87707168e4d29b4a2d30ef6b4a718694a1b4' 
  AND token = '6cUBwr/qzYAewgwirt5p7xhJe+eQSnz5/h2+RZL64QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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