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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6d05fef90ec4df159abc8fad30b6ae51f799f2f32e54298273de82168d4e2e' 
  AND token = 'BjM5HbZ7zkYobKXur6Pbcag9HiajhcbNYqcMSmUdUOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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