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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e72bb5087365de0ac030b78b8026cf46d3a26305527c04419b103f29d5f83c3' 
  AND token = 'qfm4URft4ijIVVEMQDrsx56qQ6kQ+vaRa9iWqLNJG8M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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