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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbddff2fd5535e93f26787727aa1d3411be01897e34025816d6d542039d2eaa0' 
  AND token = 'j5wgxQGhmfiCHX0aiefax/cHAXRkdPG+/Tf0zs44w7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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