SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86e2dda56d28bf97f7edc49ca11d144fe7e7fb73006d3280194e2495e5c73a0e' 
  AND token = 'PvzbW2nnbwu9QlpwIcZX2pGuUPhgKBHg/3I7m/hdXkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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