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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70803aab1a782813684c73ae89b29f0a4a8c2404d85076893e153e4142f64f9d' 
  AND token = 'dStdToXtNjtCQNeM4WCnq7TkAxdBPEdS1CTfkON6I/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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