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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dba9600a38ea5db7e7876a533da225aed36fe8f059e5144e1f50753f117d3802' 
  AND token = 'xR0/6tf6DLAOXtdanht9my08U8sY+s5lM24qpzVxzto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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