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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e6caf446a1bca88afc95300683541fe741ad7a1d3d12d33620c2882eab30c1f' 
  AND token = 'ZoB40OFC233OiPRsIme0LE1Ufs2OOWe2Zl5jnikjmys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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