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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c12ac665a1bec57a7e8f2dae2a6579b75f9d11b17b96538d72e8fe08a450f5' 
  AND token = 'qlGifOR7aPJzVub8AWJPLSwk1GBXqiy53sJ10aHASm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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