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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '622b0633921b06ae3fd467ca46e1cd2655bf0e06543a1800c00166a62618391c' 
  AND token = 'ERq09JfhEWhpzsgOGxEtHf7O1iD09rOiZo/Ri/siAg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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