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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f083049be72ccf63480ad496aba2bc3e7f36c4410546aec16442e5fee6767892' 
  AND token = 'C2nbgF5WKGwyfNAlDMagyuyIMM6mXY26x2i40k6Nuu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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