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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5509b61878c5df14b44c475f5813988ec330ff925754f7e16b7320afbd7af6e5' 
  AND token = '6AAiTVhtiFcpSp9/vPpsCkm266wxgTa6B345KKmteAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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