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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '986983fb7da1d080f06302789ce85a2eba8bb27cbec27c5e0f39815de363f131' 
  AND token = '0N13TkBvAXoHAGnQF347WiK8H2CUimk3tydsXsevTTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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