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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04e54f01f09502172a43b0de777cc5ddc778ca3063ce994be5841eebc23ca75' 
  AND token = 'tLMQzLqPEktqrgW5Eov7ILUAPlNEAcpEK0kvBnd7W28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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