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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18bb243d9c7beb8221fb26d8216231fa1ae75993dfba2f3d74b00a41836d9567' 
  AND token = 'eIjUzW9oZOe3L3y4It/HuX8gq2kuHONdsg937YDiG0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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