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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae38972fb179a6e8b1e391a90e9a69f6d88561a4942526a29c190608b864427' 
  AND token = 'qcdNEB3rOyY7+6vNOQGEo/ke2AunquiEQIojrC8Yk7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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