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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dab4c1f26370546df51da1dca50d50fd6b9386da8a506ca94e11b5aa50c5cb51' 
  AND token = '7sKBh/8IXElWtIe+D8J2HN9Y84BvHyJJwCWyG/Ox/XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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