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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '544250b673ab706061bc9347cf4d0e31c40f34e0f6b2f44a6a8eb948edf19c9e' 
  AND token = 'tG8apnCHHLQlzMbrj+LmxoWnm8yVgqTaJhb7cNxFICE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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