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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02851b82e5adf0426d93dd35d7a945e7d5cc3a82c86ad5e3f5cc3a67a43a5147' 
  AND token = 'cFVrlm+po04NCmvLBBDVfzfLI++BbdpqCDl8mMR04oE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00119

JSON explain

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