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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '890d14df2851c2a86a7f2d5ef6bd9ddc3d585e45f0a0ed89d505f75645c0efb7' 
  AND token = 'Q7wmfTSA7LnLtgGxlSEUHp55BgjVWsUSNJ6CmwKhS4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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