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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca6d80243567211fd952e4cc98053ec6aad2bdeeb55482c504e4c2883633913' 
  AND token = '3d2jvPUyNmy+mQgh85VeHA5tL9l3nd5evK2E+iKvXAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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