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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91390ea687ee2f6415592ac404ae0bf437371ff85fa3c8054c6e1061c7f7cd6' 
  AND token = '3fSH78dX6fmP1iVPHU0SFu6+MrFBNnZDxW+7PEMMoGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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