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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9a0d86905f7b0ea3d8800a30d35e3c1273a1e9cbcbce19d9177481649ebe717' 
  AND token = 'epgja70cNrELnBCG82r7Um7da8EmOdnRKaCKKf+yUH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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