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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f092a35f061cfb6e129b000adac31565ecdf16ab5f22e9d1e2fa9bfa04c3a950' 
  AND token = '2GFxw0Q2uq5UsUzrrPi5TcaY2izG21D+6ocTubnTIFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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