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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c8df73847609a4d7c7b97b72bcc9473abc6494af4f188d357e67bb78efc30b' 
  AND token = 'S4NXGcuwjPEIKhU6DB9E+rRhadxulVWPknawEFRsx7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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