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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd472664c8fb4363753a234c7378e202a22ea44893d63bd257416a9d2eb9ae5f' 
  AND token = 'w/JT2DyEnYYU3xLRGTpW6E9Pfu3jNiki5wugMcjP1ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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