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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6ff4d6e9360c190f4c765ec96ec0d73e2d0e5a8e2611c3d649112fd020b35d6' 
  AND token = 'Gq29P/69hQz5I/l0sWzmSZ3EUl+EKwXkEorrfbVCou4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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