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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '903b31afd5a186b71d6b1dfeef09aee79a783b32782a2fd10150e1e8ba88c56c' 
  AND token = 'Q4rjfhox42/KBzcjXF7TsK4Fc/WER4xIblAbAP85kE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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