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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87d2a02818cf88fb1cefee3b0311d86021137a2a85d8f68df2281b26c68cc02c' 
  AND token = 'sUiOZJQB1u+5CELTIf5PwVJhjkNw8WxhVjvmJCO/c0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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