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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6c6fd04010fa7d7084b6fa0fb0def494d32335e282337bafb72aa7dbc3f0e67' 
  AND token = 'KC2HDcQMfzPRwiACFu9saLbpLGODXR92K2Y5sY5oPHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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