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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1f03e4b322d39249c75424a0058fe2a3cc644d74b922180a2214aa8604898b6' 
  AND token = 'PtEt1GL/bYNfgaG2F5B8kMlemrv9etIA6dQ/miV8I5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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