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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cf7c7c4f96916790c234cf43e486e904990d1403a44bace9d237ae04bdd7fc8' 
  AND token = 'Mw/5a2tniNEYGS5BbxlXFTh3iA8csqqP4sq+APhVsXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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